Purple screen-freeze after resume from lock screen / screen blank

[telamon]

So I upgraded both my laptop and my desktop 12:th Nov. Been using it happily and without issues for almost two days.

Yesterday late evening (13th) before going to sleep I wake my desktop using mouse movement.
LockScreen appears do the upwards drag gesture (which is a bit annoying) and when the curtain rises all i get is a glitchy side-dock and a blank purple gradient.
The side-dock weirdly enough shows the previews of applications when hovering the app-icons, but interacting with it using click doesn't bring the application-windows up.

So I go to bed thinking i'll fix this tomorrow..

Wake up, move the mouse on desktop-pc, screen turns on and it's still the same glitched desktop view.

So I pick up my laptop and surprisingly enough I have Exactly the same problem there!
With the exception that instead of the screen being blank I see some kind of malformed version of the applications I had running last evening.

Both computers failed at resuming from screen-lock, so I reboot both of them.
Laptop is working for now (That's how i'm filing this bug).
But desktop computer went into screen blank due to inactivity and froze again when i tried to wake it up.

I never had this issue before 18.10, and I suspect that some bad auto-update went out yesterday since both of computers mysteriously started failing around the same time.

Desktop Computer (AMD based custom build):
===============================================
Description: Ubuntu 18.10
Release: 18.10

$ apt-cache policy linux-image-generic
linux-image-generic:
  Installed: 4.18.0.11.12
  Candidate: 4.18.0.11.12
  Version table:
 *** 4.18.0.11.12 500
        500 http://se.archive.ubuntu.com/ubuntu cosmic-updates/main amd64 Packages
        500 http://security.ubuntu.com/ubuntu cosmic-security/main amd64 Packages
        100 /var/lib/dpkg/status
     4.18.0.10.11 500
        500 http://se.archive.ubuntu.com/ubuntu cosmic/main amd64 Packages

$ apt-cache policy gdm3
gdm3:
  Installed: 3.30.1-1ubuntu5
  Candidate: 3.30.1-1ubuntu5
  Version table:
 *** 3.30.1-1ubuntu5 500
        500 http://se.archive.ubuntu.com/ubuntu cosmic/main amd64 Packages
        100 /var/lib/dpkg/status

$ apt-cache policy ubuntu-desktop
ubuntu-desktop:
  Installed: 1.425
  Candidate: 1.425
  Version table:
 *** 1.425 500
        500 http://se.archive.ubuntu.com/ubuntu cosmic/main amd64 Packages
        100 /var/lib/dpkg/status

Laptop (Thinkpad Carbon X1 3rd gen):
==============================================

Description: Ubuntu 18.10
Release: 18.10

$ apt-cache policy linux-image-generic
linux-image-generic:
  Installed: 4.18.0.10.11
  Candidate: 4.18.0.10.11
  Version table:
 *** 4.18.0.10.11 500
        500 http://se.archive.ubuntu.com/ubuntu cosmic/main amd64 Packages
        100 /var/lib/dpkg/status

$ apt-cache policy gdm3
gdm3:
  Installed: 3.30.1-1ubuntu5
  Candidate: 3.30.1-1ubuntu5
  Version table:
 *** 3.30.1-1ubuntu5 500
        500 http://se.archive.ubuntu.com/ubuntu cosmic/main amd64 Packages
        100 /var/lib/dpkg/status

$ apt-cache policy ubuntu-desktop
ubuntu-desktop:
  Installed: 1.425
  Candidate: 1.425
  Version table:
 *** 1.425 500
        500 http://se.archive.ubuntu.com/ubuntu cosmic/main amd64 Packages
        100 /var/lib/dpkg/status

[Daniel van Vugt (vanvugt)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. This particular bug has already been reported and is a duplicate of bug 1769383, so it is being marked as such. Please look at the other bug report to see if there is any missing information that you can provide, or to see if there is a workaround for the bug. Additionally, any further discussion regarding the bug should occur in the other report. Feel free to continue to report any other bugs you may find.

[telamon (telamohn)]

Thank you for letting me know! :)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Øby (stian-oby)]

How is this a duplicate of bug #1769383 ?

I experience the same issue as described here, and have for several weeks, but the bug referred to seems to concern a very different issue. Unless I am missing something?

[Wynne Crisman (wcrisman)]

This is NOT a duplicate of 1769383!

I am having this same issue. It only occurs when I have dual screen going and allow the computer to go to sleep or lock. Bringing it back up gives green on both screens, and if I unplug and re-plug the monitor(s) in I get a black screen. Logging in is not possible. I have to force a hard reboot to get it working again.

[Wynne Crisman (wcrisman)]

Forgot to mention - running latest 20.04 as of Sept 15 2021